Foam mattress core



FIG. 1 is a top plan view of a foam mattress core showing my new design, with the area between the outline around the repeated shapes and the shapes being recessed from the rest of the top with the pattern repeating continuously;

FIG. 2 is a side elevational view of FIG. 1; and

FIG. 3 is an end elevational view of FIG. 2.

The characteristic features of my design are the differences between the repeated shapes in the embossed pattern shown in FIG. 1: (1) at the courses, (2) along the shorter side, (3) along the longer sides, and (4) inside the outer rows of repeated shapes. 

The ornamental design for a foam mattress core, substantially as shown and described. 